Combine the two skills Hide and Move Silently into the new skill Stealth. Combine the skill points you had spent in both into this new skill (any points that would exceed your maximum allowed for your level are now free and can be re-spent). You can use the new skill check in place of both the old ones. If your class offers either Hide or Move Silently as a class skill, then Stealth is a class skill.

8 ranks: You gain a +2 bonus to Stealth checks.

13 ranks: Once per day, you may reroll a Stealth check, taking the higher result.

18 ranks: Once per day, when you take 10 on a Stealth check, treat it as a 15 instead.

23 ranks: You can Hide in Plain Sight like the Ranger class. You take a -10 penalty to hide checks you make while being observed.

Special: Bonuses to Hide or Move Silently from racial abilities, class features, magic items, etc. will receive that bonus only to that part of a Stealth check.